export default function (datetime) {
  if ((datetime + '').length === 10) {
    datetime = datetime * 1000
  }
  var date = new Date(datetime)// 时间戳为10位需*1000，时间戳为13位的话不需乘1000
  var year = date.getFullYear()
  var month = ('0' + (date.getMonth() + 1)).slice(-2)
  var sdate = ('0' + date.getDate()).slice(-2)
  var hour = ('0' + date.getHours()).slice(-2)
  var minute = ('0' + date.getMinutes()).slice(-2)
  var second = ('0' + date.getSeconds()).slice(-2)
  // 拼接
  var result = year + '-' + month + '-' + sdate + ' ' + hour + ':' + minute + ':' + second
  // 返回
  return result
}
